I'm not even sure it's written in HTML, but it seems like it is. What I would like to do is querying the database without having to manually fill up the form each time, but instead building some URL directly within my code libraries to get to the result page automatically.

I'll give you one example of how I would like to fill up the form ;

Coordinates : 00 00 00 +00 00 00

All other fields : default values

You can enter it by hand and see what the results page should be like in this case. I would like to get to this "result page" without filling the form manually, so I would need to find out how to build a URL in which the form's entries are encrypted. How would I do that ?